FIZIKA A 10 (2001) 3 , 105-112

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THE TWO-PHOTON DECAY OF 1s2s 1S0-LIKE STATES IN HEAVY ATOMIC SYSTEMS

PAUL H. MOKLERa and ROBERT W. DUNFORDb

aGSI, Planckstrasse 1, D-64291 Darmstadt, Germany

bARGONNE National Laboratory, Argonne, IL 60439, U.S.A.

Dedicated to Professor Kseno Ilakovac on the occasion of his 70th birthday

Received 24 May 2001; Accepted 5 September 2001
Online 30 December 2001

In He-like systems the direct decay of the 1s2s 1S0 state to the 1s2 1S0 ground state is "forbidden". The transition 1s2s 1S0 1s2 1S0 by two photons sensitively probes the structure of the complete atomic system. In particular, the shape of the two-photon spectrum is sensitive to it and also reveals for heavy atomic numbers details of relativistic effects in strong central fields. A brief survey on this field of research is given with special emphasis on high nuclear charge Z.

PACS numbers: 31.30.Jv, 32.80.Wr
UDC 539.183
Keywords: heavy He-like systems, two-photon decay, 1s2s 1S0 1s2 1S0 transition, relativistic effects
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